Segundo seminario nacional sobre conservación de suelos y agua: documento introductorio. 18-19 Ago de 1994

agricultura agriculture bosques cambio social central america changement social conservation de l'eau conservation des ressources conservation des sols crops cultivos development policies economic development erosion forests labranza natural resources nicaragua nutrientes nutrients plante de culture recursos naturales resource conservation ressource naturelle social change soil soil conservation sol sostenibilidad substance nutritive suelo sustainability tillage travail du sol water conservation